How to check the tightness of coffee tins

   Tin cans are widely used in various fields of coffee and beverage packaging and pharmaceutical packaging. With its advantages of economical packaging cost, easy processing, mature production technology and easy production, it has become an extremely common coffee packaging in the current market. The tightness of iron cans is an important indicator of packaging quality. Regarding the quality and shelf life of the products in the cans, it is also a necessary guarantee for product transportation. This article focuses on the inspection methods of the tightness of iron cans.

  In the packaging industry, tin cans are flooded with all kinds of fields, needless to say they are widely used. Usually, the materials used in cans are tinplate, aluminum, steel, etc., and its excellent printing performance can play a good role in publicity: as a commodity, the packaging of tin cans is also a guarantee for product circulation, so as to prevent logistics and transportation. Product damage: One of the main functions of iron cans is to maintain freshness and quality, so that the products that reach consumers can meet the expected design requirements. However, we may not be short of various complaints from customers or claims from customers, which not only puts the company under tremendous economic pressure, but also damages the company's reputation. The direct reason for all of this is that the quality of the packaging cans is not good enough, causing significant losses to the company. Such losses are not worthwhile. Therefore, how to ensure the quality of canned food packaging has become an effective guarantee for improving the safety factor of canned food and extending the shelf life of canned products.

1. The importance of testing the tightness of tin cans

The losses caused by unqualified cans are heavy, and the lessons are profound. How to ensure the quality of cans,

It has become a necessary condition for testing. There are two main reasons for the quality problems of iron cans: one is that the material quality of the iron cans is poor, for example, its hardness is not enough to cause loss of protection, or the thickness of the material does not meet the standard. Second, improper sealing conditions cause the sealing temperature, time and pressure to become the three elements of heat sealing. To ensure the reliability of canned food quality and scientific testing, not only can clearly understand the condition and damage rate of canned food, but also provide a strong guarantee for the sustainable control of product quality.

2. Testing method for the tightness of iron cans

1) negative pressure test, also known as foaming method

Test principle: Immerse the tin can to be tested in a vacuum tank filled with water, and vacuum the vacuum tank until the internal pressure of the tin can is controlled

Under external pressure, it will expand and increase the population. When the seal is not good, bubbles will come out. If no bubbles come out, the seal is good

2) Positive pressure test.

Test principle:

Positive pressure test is more complicated than negative pressure test. The main test methods are:

Damage test: Fill the tank with gas until it breaks, and evaluate the sealing strength with the maximum damage force:

Standard creep: Fill the tin can with a certain pressure of gas through the change of pressure in the tin can and keep it for a certain period of time.

To judge the tightness of the tin can.

Creep rupture: Fill the iron tank with a certain pressure of gas and keep it for a specific time, and then continue to fill the iron tank with gas

Body until it ruptures, through the pressure change in the process and the rupture pressure to judge the iron can after creep

The torsion resistance performance.

We carry out strict quality inspections on the tin cans we produce to ensure that the tin cans meet customer requirements. The company takes quality as the cornerstone,strives to create high-quality tin box products, provides customers with one-stop services such as tin box design, manufacture and sales with high-quality services in the industry for many years, and creates highly competitive packaging solutions for customers in all aspects.